Improvement in sewer-pipes



STUW'. Sewer-Pipes.`

Patented March 31, 1874.

MQ @ms me NITED STATES PATENT FFIGE.

HENRY M. STOW, OF SAN FRANCISCO, CALIFORNIA.

lMPROVEIVlENT IN SEWER-PIPES.

Specification forming part of Letters Patent No. 149,080, dated March 3l, 12574; application led December 16, 1873.

l To all whom t may concern:

Be it known that I, HENRY M. Srow, of San Francisco, in the county of San Francisco and State of California, have invented certain Improvements in Sewer-Pipes, of which the following is a specification:

This invention relates to improvements in sewer-pipes made principally of wood.

In the annexed drawings, Figure l represents a side view of a section of pipe made according to my invention, and Fig. 2 a crosssection of the same.

The invention consists in ina-king a pipe of wooden staves put together in the forin of two concentric cylinders, with pitched paper interposed between them, the staves being so arranged as to break joints, and the wh ole iirxnly bound together by strong wire or strap-iron wound spirally around the outer cylinder.

A is the inner cylinder; B, the outer one; C, the wrapping-wire, and i the paper between the two cylinders.

In putting the staves together, I interpose pitch between them in all the joints, and this obvi'ates the necessity of jointing the staves. Between the inner and outer cylinders I interpose one or more layers of coarse, thick paper, or other fibrous or textile material, well saturated with pitch, and the pipe may also be coated inside and outside with pitch, if desired. l prefer to use asphalt pitch applied hot, but any other suitable pitch or cement which is insoluble in water will answer the purpose. The stares of the inner and outer cylinders are all of the sanie length; but they are so put together that the inner cylinder will protrude from the outer cylinder a short distance at one end, as shown at d, Fig. l, and forni an annular rabbet at the other end, for the purpose of jointing the sections of pipe together. The outer cylinder lnay be wrapped with paper before winding it with wire or strap iron, it' deemed expedient; but I do not consider this essential. The pitched paper between the inner and outer cylinders may be omitted, and a coating of pitch only interposed; but I prefer to use the paper or its equivalent.

That I claiin as iny invention, and desire to HENRY M. STOW.

Vitnesses:

JT J. CooMBs, WILLIAM FITCH. 

